Clamp for use in connection with socket carbon-brush holders.



No. 733,436. PATENTED JULY '14, 1903.

0. M. STIEGLER. CLAMP FOR USE IN CONNECTION WITH SOCKET CARBON BRUSHHOLDERS."

APPLICATION FILED NOV. 8, 1902. N0 MODEL.

Fig-T.

UNIT D STATES Patented July 14, 1903.

PATENT OFFICE.

OSCAR M. STIEGLER, OF BOSTON, MASSACHUSETTS.

SPECIFIGATION forming part of Letters Patent No. 733,436, dated July 14,1903.

Application filed November 8, 1902. Serial No. 130,509. (No model.)

To (tZZ whom it may concern:

Be it known that I, OSCAR M. STIEGLER, a

citizen of the United States, residing in Bos-- ton, in the county ofSuffolk and State of Massachusetts, have invented a certain new anduseful improvement in clamps to be used in connection with socketcarbon-brush holders for the purpose of forming a contact between thecarbon brush and the holder by means of thin copper strips attached tothe clamp, of which the following is a specification.

The objects of my invention are, first, to have a clamp which can beremoved from the carbon brush by means of a thumb-nut without takingeither nut or screw from the clamp; second, to have a clamp which willadjust itself to the variations in thickness of carbon brushes, and thusform a good contact. I obtain these objects by the mechanism illustratedin the accompanying drawings, in which Figure 1 represents thesheet-metal punching of the clamp. Fig. 2 is a side view of the clampwhen formed into shape, showing screw and thumb-nut. Fig. 3 is a frontview. Fig. at is a top View. Figs. 5 and 6 are views of a socketcarbon-brush holder, showing the clamp attached to carbon brush. Fig. 7represents a carbon brush slotted at one end.

Referring to Fig. 1, a a form the top and bottom of the clamp betweenwhich the carbon, Fig. 7, is clamped, as shown in Figs. 5 and 6. b b arethe ends which form the ears or loops into which the copper strips t arefastened and may be screwed to any part of the holder, as shown in Fig.5.

Fig. 2 is a side view of the clamp, of which (1 is a thumb-nut; c, abolt with a square unmaking the clamp more pliable, and thus I formingitself to the variations of thickness of carbon brushes. 1) Z) are theears or loops, as also shown in Figs. 3 and 4, being bent in oppositedirection from a a, into which the thin copper strips are fastened.

Fig. 3 is a front view of the clamp, and Fig. 4 is a top view.

Figs. 5 and 6 are views of a socket carbonbrush holder, showing thecarbon brush in the socket with the clamp attached. t represents thincopper strips carrying the current to the brush-holder. Fig. 7represents views of a carbon brush, of which f is a slot which admitsbolt 0, thus allowing the clamp to be attached without removing thebolt.

I do not know of any clamp of a similar construction ever having beenused in connection with a slotted carbon brush forthe purpose specified.

I therefore desire to secure by Letters Pat- Gilt-*- 1. A clamp formedof sheet metal, the corners being formed into half-circles, with ears orloops in the opposite direction of the clamping parts, for the purposespecified. p

2. The combination of a clamp formed of sheet metal with ears or loopsbent in the opposite direction from the clamping parts and a carbonbrush with a slot at one end for the purpose specified.

OSCAR M. STIEGLER. Witnesses:

WILLIAM P. MEEHAN, FREDERICK A. SUCK.

